Kouri Sand Member

Kouri Sand Member Tokuhashi and Endo, 1983

Type locality: Kori, Nagara city, Chosei county, Chiba prefecture
Coherent formation
Fore-arc basin sediments (Kazusa trough)
Pleistocene

Sedimentary facies: Marine
Sedimentary facies: Open bay
Sedimentary facies: Inner shelf subjected to storm waves
Sedimentary facies: Sand ridge deposit
Water temperature: Warm ocean current
Lithofacies: Sands
Sedimentary structures (Minor): Cross stratification
Paleocurrent: West to East

Thickness: 0 - 90 m

Kasamori Formation (North)
[ Upper ]
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Kouri Sand Member
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Yoro Sand Member
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[ Lower ]

Kasamori Formation (South)
[ Upper ]
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Sanuki Mudstone Member / Sunami Sandstone Member
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Nagahama Sand and Gravel Member
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[ Lower ]

Kazusa Group (Boso peninsula)
[ Upper ]
~~~~~~~~~~~~~~
Kasamori Formation / Kongochi Formation
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Mandano Formation
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Chonan Formation
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Ichijiku Formation
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Kakinokidai Formation
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Kokumoto Formation
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Umegase Formation
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Otadai Formation
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Kiwada Formation
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Ohara Formation
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Namihana Formation
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Katsuura Formation
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Kurotaki Formation
~~~~~~~~~~~~~~
[ Lower ]

------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown

Distribution: Kori - Harigaya - Osakabe, Nagara city, Chosei county, Chiba pref.; Shingaya, Ichihara city, Chiba pref.; Shibana - Yoshii - Honno, Mobara city, Chiba pref.; Nagata, Oamishirasato city, Chiba pref.
Fossils: Shellfishes
Fossils (Trace fossils): Rosselia socialis
Tephra: Ks7.5A, Ks7.5B

Nanayama et al. (2016) Geology of the Mobara District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 101p. (in Japanese with English abstract 4p.)
Tokuhashi and Endo (1984) Geology of the Anesaki District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 136p. (in Japanese with English abstract 6p.)